Base for chairs



FIG. 1 is a perspective view of base for chairs showing my new design;

FIG. 2 is a front side elevation view thereof;

FIG. 3 is a rear side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view thereof.

The broken lines showing a chair and wheels in FIG. 8 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for base for chairs, as shown and described. 